Britney Spears Reportedly Teeters on the Brink on X-Factor 1Britney Spears is reportedly a nervous wreck behind-the-scenes on her musical reality show “X-Factor.” Only fellow Judge Demi Lovato is keeping her from being overwhelmed by insecurities and paranoia, according to a new report.

Spears’ mental health has been a question mark since a meltdown in 2007 landed her in rehab and under the thumb of her father.

She’s 31, yet she continues under a court-ordered conservatorship. Father Jamie Spears and Jason Trawick, her former agent, now fiancé, make even the smallest decisions for her. A court in August refused to lift the conservatorship even over her personal life.

On the show, she looks like a cutout paper doll and her facial expressions suggest she is so tightly wound she could explode in tears at any minute. It’s amazing she’s even keeping it together, because backstage it’s another story, according to a new report.

“Britney was in Demi’s dressing room, crying her eyes out because she’s cracking under the strain of producers constantly coaching her on how to be more outgoing, talkative and constructive on-camera,” a witness told The National Enquirer’s Mike Walker.

A particularly troubling photo of Spears emerged in May showing that she had chewed her fingernails down to stubs, causing them to bleed.

“Demi tried to comfort her – saying it was all in her head – but it’s not, of course, because despite the coaching, Britney continues to come across as stiff and boring,” the source said.

Lovato, who’s also struggled with emotional problems, has hit her stride on the show and seems to be much more relaxed and actually enjoying it.

Brit, meanwhile, continues to rack up glowing reports in the tabloids, which suggests a publicist is trying to compensate for her lackluster on-air performance. US magazine lauded her form-fitting black Herve Leger dress that exposed her toned midriff on yesterday’s show.

Judge L.A. Reid has been particularly supportive, and praises her often. Check out the video below and click here to follow TheImproper on Twitter for the latest updates on X-Factor.